Warning signs will be positioned at major recreational areas around Lake Eppalock and will remain in place while high levels of blue-green algae are present, but the lake will not be closed to the public.
G-MW recommends water users at Lake Eppalock, near Heathcote, seek an alternative water supply for stock and pets.
G-MW recommends people and pets do not enter the water and those who come into contact with affected water should wash affected skin immediately in clean, cold water and do not use affected water for cooking, drinking, washing or showering.
Boiling the affected water will not make it safe for these purposes.
Blue-green algae occur naturally in water bodies and contains toxins that are harmful to humans and animals.
Symptoms of algae contact include skin rashes or itchiness, sore eyes, ears and nose, or if swallowed, nausea or vomiting.
It is not possible to predict how long the algae will remain at high levels and G-MW is continuing to monitor the situation at Lake Eppalock.
■Keep up to date with blue-green algae warnings at: www.g-mwater.com.au/news/bga or phone the G-MW blue-green algae hotline on 5826 3785.
■For more information about blue-green algae and your health, visit health.vic.gov.au or phone Nurse on Call on 1300 606 024.